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CTV-1010XKTL

Service Manual - CTV-1010XKTL

R

4. Alignment
4-1 Preadjustment
4-1-1 Factory Mode

and Adjustments

1. Do not attempt these adjustments in the VIDEO mode. 2. The Factory Mode adjustments afe necessary when either the EEPROM(QO02) or the CPT is replaced. 3. Do not tamper with the "Adjustment" screen of the Factory Mode menu. The screen is intended only for factory use.

4-1-2 When

EEPROM

(0002)

is replaced

1. When QO02 is replaced ali adjustment data revert to their initial values. It is necessary to reprogram this data. 2. After QO02 is replaced, warm up the TV for 10 seconds.

4-1-3 When

CPT is replaced

1. Make the following the adjustments after setting up purity and convergence: White Balance Vertical center Vertical size Horizontal size

4-2 Factory I Servi ce Mode
4-2-1 Procedure for the "Adjustment"
;

Mode

1. This mode uses the standard remote control. The Factory (Service) Mode is activated by pressing the"Factory"key on the remote control. 2. The Factory Mode will be displayed. The Factory Mode has six components : VCO ADJ, SCR ADJ, HRS, HEIGHT, W. Bal, AGC Auto. 3. Access the Adjustment Mode by pressing the VOLUME keys (Up or Down). The adjustment Parameters adjusted afe listed in the accompanying table, and they afe selected by pressing the PROGRAM keys (Up or Down). 4. The VOLUME keys increase or decrease the adjustment values.

-~

4-2-2 Servi ce Adjustment Function PIF VCO Screen voltage Horizontal SHIFT Vcrtical Amplitude REO Gain Green Gain Blue Gain REO Cutoff Green Cutoff Blue Cutoff Auto Gain Contrai Wide PIF VCO Narrow PIF VCO Auto Gain Contrai

Parameter OSD Abbreviation VCO ADJ SCR ADJ HRS HEIGHT R-H G-H B-H R-L G-L B-L AGC Auto VCO CORS VCO Fine AGC Manual O -63 O -63 O -63 O -63 O -63 0-511 O -511 0-511 O -63 O -15 O -127 0-63 32 32 35 35 35 380 380 380 47 8 64 47 Range O -127 Initial Date 64

4-3 Other Adjustments
4-3-1 Generai Alignment Instructions

1. Usually, a colar TV needs only slight to.uch-up adjustment upon installation. Check the basic characteristics such as height. horizontal and vertical sync and focus. 2. Observe the picture far good black and white details. There should be no objectionable .colar, shading: if colar shading is present, perform the purity and convergence adjustments described below. 3. Use the specified test equipment or its equivalent. 4. Correct impedance matching is essential. 5. Avoid overload. Excessive signal from a sweep generator might overload the front-end of the TV. When inserting signal markers. do not allow the marker generator to distort test results.

6. Connect the TV only to an AC power source with voltage and frequency as specified on the back cover nameplate. 7. Do not attempt to connect or disconnect any wires while the TV is turned on. Make sure that the power cord is disconnected before replacing any parts. 8. To protect against shock hazard, use an isolation transformer.

4-3-2 Automatic Degaussing
A degaussing coil is mounted around the picture tube, so that external degaussing after moving the TV should be unnecessary. 8ut the receiver must be properly degaussed upon installation . The degaussing coil operates far about 1 second after the power is switched ON. If the set is moved or turned in a different direction, the power should be OFF far at least 10 minutes. If the chassis or parts of the cabinet become magnetized, poor colar purity will result. If this happens, use an external degaussing coil. Slowly move the degaussing coil around the faceplate of the picture tube and the sides and front of the receiver. Slowly withdraw the coil to a distance of about 6 feet before turning power OFF. If colar shading persists, perform the following Colar Purity and Convergence adjustments.

4-3-3 High Voltage Check
CAUTION : There is no high voltage adjustment chassis. The 8+ power supply should be +8.5 volts (see table 1). 1. Connect a digital voltrneter to the second anode of the picture tube. 2. Turn on the TV. Set the 8rightness and Contrast controls to minimum (zero beam current). 3. Adjust the 8rightness and Contrast controls to both extremes. Ensure that the high voltage does not exceed Maximum High voltage (see table 1 ) under any conditions.
INCH 10 +8 (Volts) 8.5 Maximum High Voltage 23 KV

Table 1

+8 and Maximum High voltage

4-3-4 PIF VCO Adjustment
1. Input 189.25MHz signal(O7ch) to antenna. Use a pattern generator. or tune in the active station in your area. 2. Adjust VCO in the service mode.

,

4-3-5. RF AGC Adjustment
1. In put a VHF HIGH (EU 7CH) channel (65d81J) 2. Adjust the AGC AUTO in the Factory Mode. 3. 8ut Now TV set is noting Adjustrnent. (Default Data: 47)

.

4-3-6 Screen Adjustment
1. 2. 3. 4. Tune to the ACTIVE channel. Adjust the FACTORY key is pressed on Remote Controller, Factory Mode shows up. Selected OSO colar is red. When the VOL + keyis pressed, the screen turns to one horizontalline.

5. Adjust SCREEN VR of FBT to make 1 dot bar. 6. After adjustment, once VOL + key is pressed again, it turns to FACTORY Mode.

4-3-7 WHITE BALANCE ADJUSTMENT (MANUAL)
1. Tune the monochrome (Lion head pattern) channel and warm up the set far 20 minutes. 2. Select the FACTORY MODE. THE FACTORY (Service) MODE is activated by pressing the "FACTORY" button on the remote contrai. 3. On Factory mode, select number 5. 4. By using PROGRAM UP/DOWN button, select "WB ADJ". 5. Press the VOL + button to make horizontalline. 6. Adjust the VR Screen far a 1 dot line. 7. Adjust the cut-off controls to obtain the white horizontalline. The lines may look like white if the cut-off controls are adjusted properly.

Button NO
F unc on

Remocon
ti

1
REDD nve

2
GREEND. nve 35

3
BLUED nve

5
RED-

6
GREENCutoff 380

7
BLUECutoff 380

.

.

Cufoff
380

Default Data

35

35

Example of the adjustment (If reference colar is BLUE) 1. On horizontalline (blue colar) 2. Press button no. 5 on Remote Controller. 3. By using VOL +,- button, make/set magenta colar in 1 dot line. 4. Press button no. 6 on Remote Controller. 5. By using VOL +,- button, adjust the colar to become white horizontalline. 6. To make correct white line, repeat the above no.2-5. 7. After adjustment, press factory button to return to factory mode. 8. In case of W/B adjustment in high iuminance condition, it should be done in R-H, G-H, B-H selection

4-3-8 FOCUS Adjustment
1. Input a cross dot signal. 2. Adjust the tuning contrai far clearest picture. 3. Adjust the FOCUS contrai far well defined scanning lines in the center area of the screen.

I
4-3-9 Purity Adjustment
1. 2. 3. 4. 5. 6. 7. Warm up the receiver far at least 30 minutes. Plug in the CRT deflection yoke. Tighten the clamp screw. Plug the convergence yoke into the CRT and set it as shown in Fig. B-1. Input a black and white signal. Fully demagnetize the receiver by using an external degaussing coil. Turn the CONTRAST and BRIGHTNESS controls to maximum. Loosen the clamp screw holding the yoke. Slide the yoke backward or forward to produce a vertical green belt. (Fig. B-2) 8. Tighten the convergence yoke. 9. Slowly move the deflection yoke forward. Adjust far the best overall green screen. 10. Temporarily tighten the deflection yoke. 11. Produce blue and red rasters by adjusting the-low-light controls. Check far good purity in each field. 12. Tighten the deflection yoke.

,

4-3-10 Center Convergence

Adjustment

1. Warm up the receiver far at least 30 minutes. 2. Adjust the two tabs of the 4-pole magnets: Change the angle between them. Superimpose the red and blue verticallines in the center area of the screen. 3. Adjust the BRIGHTNESS and CONTRAST controls far a well-defined picture. 4. Adjust the two tabs of the 4-pole magnets, and change the angle between them. Superimpose the red and the blue verticallines in the center area of the screen. 5. Turn the both tabs at the same time, keeping the angle constant, and superimpose the red and blue horizontallines in the center of thescreen. 6. Adjust two-tabs of 6-pole magnets to superimpose the red and blue lines onta the green. Adjust the angle affects the verticallines, and rotating both magnets affects the horizontallines. 7. Repeat adjustrnents 2-6, if necessary. 8. Since tlle 4-pole and 6-pole magnets interact, the dot movement is complex(fig B-3).

.~~
2,... :

)

i

i i

"C~D ---W~~~~D'I I
.I

'--.
. i

tJ

,". =~
~E)O'

FIG. B-1 CONVERGENCE MAGNET ASSEMBL Y

DEFLECTION TOKE A

CONVERGENCE
/ MAGNET ASS'Y

RUBBER WEDGES

RUB WE
31mm(1-3/16")

~
ADHESIVE

ECTION TOKE RUBBER WEDGES LOCATION

FIG.

B-2

COLaR

PURITY

ADJUSTMENT

6-POLE MAGNET
ADJUST THEANGLE (VERTICAL LlNES) 4M

PURITY

ROTATETWOTABS ATTHE SAMELlNES) (HORIZONTALTIME

MAGNET

BLU RED

RED
~

GRN ~~

.

BGR

BLU RED

RED

~

GRN

~
t
6-PoleMagnets Movement Inclinethe Yokeup(ordown) Circumference Convergence DEF. Yoke by

R

R G B

4-Pole Magnets Movement

Inclinethe Yoke right(orlell)

CenterConvergence Convergence by Magnets

FIG.

B-3

CONVERGENCE

ADJUSTMENT

4-3-11 Geometry Adjustment
1. 2. 3. 4. of Input a lion head or philips pattern. Adjust VRS (R391) Volume to locate the picture in center of the TV screen. Adjust V-HEIGHT(Height). Set the vertical size to "4-5". Adjust H-PHASE(HRS). Align the center of the lion head or philips pattern with the center the TV screen.

5. Using

Devices

and Description.
(STV 2246/8)

5-1 Main Signal processar
5-1-1 Feature
o IIC Bus Contrai. o PIF circuit with Demodulation. o SIF circuit with QSS Structure. o Inter Carrier Capability. o Built in Sound Bandpass. o integrated

chroma frlters and Luma Delay Line

o OSO RGB in puts o External RGB in put o PAL/NTSC/SECAM o Black stretch circuito oVertic~l.countdown. o Two PLLs Horizontal Deflection.
;

CHROMA Demodulators.

.I
5-1-2 Pinning and Deseription Pin N8
STV224X/8X Symbol Description

STV223XD/3X1

SDIP56 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 30 31 32 33 34 35 36 37 38 39 40 41 42 43 SIFIN1 SIFIN2 AGCSIFCAP REFI AGCPIFCAP PIFIN1 PIFIN2 TUNERAGCOUT IFPLL GNO IF AM/FMOUT/SC VcclF INTCVBSOUT EXTAUDIOIN PIFLC1 PIFLC2 Vcc2 CVBSIN1 GNO2 CVBSIN2 BS Y/CVBSIN3 CHR BOUT GOUT ROUT ICATH BOSO GOSO ROSD FBOSO XTAL3/BTUN XTAL2 XTAL1 CLPF X1NAMP/CHROUT GND1 SIF Input SIF Input AGC SIF Capacitor Voltage Reference Filtering AGC PIF Capacitor PIF Input PIF Input AGC Tuner Output IF PLL Filter IF Ground AM/FM Mono Sound or Stereo Carriers Output 5V IF Supply Internai CVBS Output External Audio Input LC Input LC Input Video/Luma Supply Volta e 8 InternaiVideo Input Video/LumaGround ExternalVideo Input Black Stretch Capacitor Y(SVHS) or CVBS3 Externallnput Chroma (SVHS) Input Blue Output Green Output Red Output Cathode Current Measurement In ut OSO Blue Input OSO Green Input OSO Red Input OSO Fast Blankin ~ 3.5XMHzCrystalor Cicche Filter Tuning Capacitor 3.5X MHz Crystal 4.43/3.5XMHz C stai Chroma PLL Filter XTAL ContraiPin,VerticalAmplitudeDAC 1 Outputand ChromaReferenceSignalOutput. Chroma/ScanningGround

~/16~

STV223XD/3XJ4
Pin N

STV224X/8X

Symbol

Description

SDIP56
45 46 47 48 49 50 51 52 53 54 55 56 25 26 27 28 24 44 Vcc1 BCUSAF VERT HOUT LFB/SSC SLPF SCL SDA VccD GND D AUDIOOUT FMCAP BEXT GEXT REXT FBEXT APR CVBSOUT2 Chroma/Scanning Power Supply(8V) Beam Current Umiter Control Voltage and Safety Input(XRAY) Vertical Output Pulse Horizontal Output Pulse Une Flyback Input and Super-sandcastle Output Scanning PLL Filter 12C Bus Clock Input IlC Bus Data Input Digital SUPPIyVoltage(5V) Digital Ground Main Audio Output FM Demodulation Capacitor External Blue Input External Green Input External Red Input External Fast Blankin In ut Automatic RGB Peak R ulation Second Video Switch Output

~

~17~

5-1-3 Block Diagram (STV2246) (SDIP56)

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c

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u. -<

t:; 1-1-

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t:;

g: -<

~~~[l5::1 u.a:~m~.2.a:~m

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ffi

<5 :r

REXT GEXT BEXT

LFB/SSC

SLPF

FBEXT

X1NAMP/CHROUT

CLPF BS CVBSOUT2 CVBSIN1 CVBSIN2 XTAL1 XTAL2 XTAL3

Y/CVBSIN3
o c ~ o

~

~
FMOUT

u.~ CHR

EXTAUDIOIN FMCAP INTCVBSOUT AUDIOOUT IFPLL v~ PIFLC2 PIFLC1 SCL SDA

~ ~
u.u. a: a:

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MANUAL

Block (STV2248) Diagram (SDIP56)
~ooo~
g: .., m'8'8~u u.","mm_"",m 5550

t:;

1-5

Iffi >

t:;
o :IO

REXT GEXT BEXT

LFB/SSC

SLPF

FBEXT

X1NAMP/CHROUT

CLPF BS CVBSOUT2 CVBSINI CVBSIN2 Y/CVBSIN3 AM/FMOUT/SC CHR EXTAUDIOIN FMCAP INTCVBSOUT AUDIOOUT IFPLL PIFLC2 PIFLCI SCL SDA v~ XTAL3iBTUN XTALI XTAL2

~ z

a.

Li:~

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B
8

il: a.

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Li:

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.I
5-1-4 Functional Description The STV2238D is an integrated device which performs the processing of PIF, SIF, Video, chroma, scanning far PAL, SECAM and NTSC standards. It includes a base band chroma delay line, Video, SVHS and audio switches.

STV223XD/3X14
frequency. The automatic calibration of the FM demodulator VCO is operating in ali sound standard independently tram chroma crystal VCO frequency, which can be either 4.4 MHz or 3.5 MHz. For each sound carrier frequency, IC sends to the MCU an indication of the sound sub-carrier level so that the MCU can select the proper standard. -Sound sub-carrier level is valid when the FM demodulation VCO is calibrated. This information can be read through the 12CBus. . -Bus controls far FM de-emphasls (50 or 75 JLS) and deviation I 25 or I 50 KHz). demodulator. -~ound demodulator output: either an.AM or FM slgnal can be the output far Mono chassls, or -Sound sub-carriers far Stereo chassis.

1 -DETAILED 1. 1 -Power

FEATURES Supplies

.FM VcclF: 5 V power supply dedlcated to IF processors. .-AM VccDIG: 5 V power supply dedlcated to 12Cbus and digital parts. GND D is the ground reference of these parts. Vcc1: 8 V power supply far video switches, scanning part and the chroma decoder. GND 1 is the ground reference of ali these functions. Vcc2: 8 V power supply far the luminance, RGB processing parts and audio switch. GND2 is the ground reference of these parts.

1 4 A d.
.-U

IO

S

Wl tc

.

h

-One SCART switch. -Bus controlled volume and mute. -In case of STEREO chassis, AM sound can be selected on the main audio output.

1. 2 -PIF -AGC amplifier. -PLL synchronous demodulator. Bus controlled VCO far integrated tuning of t~e ext~rna~ LC resonator far 38.9 MHz VCO, LC coli speclficatlon has to be: C=39pF, f=44 MHz I,2%(LC ~ot c~nnected) far 33.9 MHz VCO(L), VCO 15swltchable through bus contrai. -Digital AFC through bus. -IF AGC Negative modulation: top sync regulation, regula-

1.5-

SAW Filter Switch

Control

-SA W filter switch contrai pin is available in the TQFP64 package. The SAW filter switch contrai pin permits the selection of the proper SAW filter characteristic (e.g.: M/N or BGDK characteristic selection). In a multi standard chassis, two output voltages are selected through the 12C bus: low level voltage at 0.4 V Max., and high level voltage at 4 V Min. " 1.6 -Video

tion of overmodulated signals (overmodulation regulation circuit enabled through bus contrai). Positive modulation: main regulation on white level with black levellimitation. , ..-Video -Tuner delayed AGC wlth bus contrai far AGC galn and threshold.

Swltches

switch with three CVBS inputs and one CVBS output which may be used to drive a teletext decoder. -A second CVBS output in the TQFP64 package. Capability to output recombined Y+C signal. Ali switches are independently controlled. -SVHS switch, Y input is combined with CVBS 3 input. CVBS/SVHS modes can be selected either by bus contrai (software selection), or by sensing voltage on Chroma input pin (hardware selection). If chroma input is connected to ground then CVBS mode is selected and the bus contrai is not attive. If the chroma input DC level is higher than the SVHS threshold, then the bus contrai is

1. 3 -SIF -QSS strutture. -Built in sound bandpass. AGC SIF -.DC -PLL FM demodulator far 4.5, 5.5, 6.0 or 6.5 MHz carrier. Sound standard selection is controlled by MCU. VCO of the FM demodulator is automatically calibrated using chroma crystal VCO reference

,

STV223XD/3X14X
active and controls the SVHS switch. Thus, hardware selection of the SVHS mode using a special SVHS connector including a mechanical switch is possible. In such an application, the bus contrai is set to SVHS mode, and the CVBS mode is selected by connecting the chroma input pin to ground. The first PLL is inhibited from li ne 309 to line 4.5 (or 314) in 50 Hz mode and from line 258 to line 5.5 (or 264) in 60 Hz mode. The lime constant values are chosen by means of external components. -Possibility to force through the bus the short lime constant during the ali frame. -Possibility to force through the bus the long lime constant during the ali frame. 2 -DEFLECTION PART -Possibility to force through the bus a very long lime constant during the ali frame. ...,. VIdeo !dent~ficatl?~: In~ependent ~rom P.LL1. . The video Identlflcatlon status IS avallable In the output register of the 12C bus decoder. Generation of burst gale pulses and line frequency signals from the first PLL to drive the chroma and video circuits.The burst gale pulse is also sent to the super-sandcastle generator. Frame synchronized window: -large window: [248,352] in AUTO mode, [248,286] in forced 60 Hz, [288,352] in forced 50 Hz -narrow window: [309,314] in 50 Hz, [258,264] in 60 Hz. Field frequency selection wind,ows: . -[248,286] 60 Hz mode selectlon wlndow. -[288,352] 50 Hz mode selection window. . Frame blanklng pulse adapted to standard: -from line 309 to line 21 in 50 Hz mode, -from line 258 to line 16 in 60 Hz mode. Long blanking mode: the end of frame blanking is line 21 both in 50 and 60 Hz. This mode is useful when flyback lime of the vertical output stage is longer than the 60 Hz blanking lime. It permits to optimize 50/60 Hz vertical amplifier application due to long frame blanking. output pulse duration is 10.5 lines. Horizontal output pulse: 28i.JSline pulse on an open collector output. Start-up circuit: the horizontal output is at high level (disabled) when Vcc1 increases from O to 6.0 V and when Vcc O has not reached 4 V. Soft mode circuit: it provides a softer operating horizontal output with a 75% duty cycle [tHIGH /(tHIGH +tLOW)]. That means a smaller conducting lime (161)Sinstead of 28I)s). This mode is active at start-up until two frames after VCC2 reach 75% of V CC1. It is also active at

-Fully integrated sync. separator with a low pass filter, black level alignment of the CVBS input, a slicing level at 50% of the synchronized puise amplitude. -Vertical. output pulse locked on 2 FH frequency to perfect Interlace. -Auto calibrated VCO using the chroma crystal reference. The crystal contrai Pin X1CTL indicates the crystal reference value on Pin XTAL 1. When a 4.43 MHz crystal is connected to Pin XT AL 1, the output lo ad on Pin X 1CTL must be higher than 30kQ. When a 3.58 MHz crystal is connected to Pin XTAL 1, the output load must be lower than 5k.Q. Two phase locked loops: -the first PLL locks the VCO on the video line frequency, -the second PLL compensates the line transistor storage lime. , Three lime constants far the first PLL. -[X, V]: Line number referred counter numbering. to the internalline

The long lime constant is used far normal operation. The short lime constant is automatically used during the frame retrace and in search mode of the VCR when the frame pulse is outside [258,264] and [309,314]. .Vertical Very long lime constant is used when no video recognition (very good stability of OSO). Time constants in normal selection of lime constants): operation (automatic

-50 Hz input signal: short lime constant: [306,21], long lime constant: the rest of the field. -60 Hz input signal: short lime constant:[O,16], long lime constant: the rest of the field. Inhibition of the first PLL:

~2\~

STV223XD/3XJ4X
shutdown when VCC1floats between 6 V and 5.4 V. And finally, this mode is used if far a reason, VCC2 decreases below 75% of VCC1. On shutting down, the horizontal puises are disabled when VCC1is below 5.4 V or when VCCDis below 3.5 V.
The r e ..b'it IS a POggi Il Y t o d. Isa bl e th e h. orlzonta I output

Integrated Trap Filter Q = 1.5 {f-3dB = fO(1-1/2Q C en ter trequency: ' -4.43 MHz, 3.58 MHz far PAL, NTSC. -4.25 MHz, far SECAM (-20dB rejection between 4.1 MHz and 4.4 MHz).
Switch-off in colar of standard the chroma search trap filter mode in SVHS {standard mode ~ot or

puise through the bus (forGe a high leve! on HOUT).

identified).

Capability

to switch

off the trap filter

through the bus. Sa:ety input on BCL Pino ~hen the BCL Pin is swltched to ground, the horlzontal output pulse is disabled, the inhibition of horizontal output pulse is maintained till VCC1 is lower than 3 V (switch-off of VCC1 power supply). Horizontal position adjustment controlled by bus. Bu~ control!ed OC ?utput voltage to adjust the vertlcal amplltude. Thls voltage permits to adjust the slope of the vertical sawtooth generated by the external vertical booster. .Bandwidth: Bus controlled vertlcal position. The high level of the vertical pulse permits to adjust the vertical Position .I Bus controlled 4/3-16/9 selection.The low level of the vertical pulse is 0.2 V when 16/9 is selected and 2 V when 4/3 is selected. Oversized blanking function is controlled by the voltage on FBosd. When the FBosd voltage is between the first and the second thresholds OSO RGB signals are selected. When FBosd is higher than the second threshold (blanking threshold at 4V), RGB outputs afe blanked during the whole field buI noI during inserted cuI-cfr lines (cut-off loop always active). The blanking feature, through the FBosd input pin, enables vertical oversize blanking when a 4/3 picture is displayed on a 16/9 screen in zoom mode. The picture outside the screen is blanked by the oversize blanking pulse provided t>y the extemal verticallC (STV9306, STV2145). Combined flyback input and super-sandcastle output: The line blanking level is clamped at 3 V, burst key pulse voltage is 5 V and vertical pulse voltage is 2 V. The li ne pulse is extracted with a slicing level at 2.5 V, it is used far RGB line blanking and PLL2 contrai. rated Chroma Band ass 9 p Q = 3.5, Center trequency: 4.43 MHz, 3.58 MHz. Bus contrai trequency shift permits to optimize the chroma response far video signal trom IF stage . Integrated Beli Filter far SECAM Inte

Q = 16, Center trequency: 4.286 MHz. Bus contrai trequency shift permits to optimize the chroma response far video signal trom IF stage. Integrated Luma Delay Line 8 MHz.

F .'ters Tumng .
Ali filters are tuned thanks to a reference phase locked loop. The PLL is based upon a trap filter, a phase comparator and an internalloop filter (capacitor). The reference signal is the continuous carrier wave trom the chroma VCO {4.43 MHz or 3.58 MHz).The PLL. a~justs the center trequency of the trap so that It IS equa I to the reference si~nal. The tuning. voltage of the PLL is used to adJust ali th~ other Integrated filters. The Beli filter is fine tuned wlth a s~cond P.LL operating during trame retrace. The beli fllt~r tunl~g voltage is memorized on an external capacltor (Pln BTUN).

4 -VIDEO

CIRCUIT

3 -FIL TERS

One RGB inputs application (SOIP56): Contrast contrai on RGB (OSO) is tracked to lum~nance ~ontrast contro~. Maximum attenuation on lumlna~ce. ISo -24 da, maxlmum attenuation on RGB (OSO) IS Ilmlted:o -12 da. Contrast contrai on RGB (OSO) can be dlsabled through the bus then RGB (OSO) gai~ is fixed a~ma,ximum value. Two RGB Input appllcatlon: RGB (OSO) input has the priority against the external RGB. The RGB (EXT) source is matrixed into YUV signals far colar and contrast adjustments. Brightness adjustment acts on internai RGB, external RGB and OSO RGB signals. Contrast contrai acts both on external and internai RGB, maximum attenuation is -24 da. It

..I
STV223XD/3X14X
also attenuation RGB brightness brightness. Bus Possibility through fast the blanking during blanking register. the to bus. disable A fast input frame detection The bus. RGB OSO and the blanking OSO RGB (EXT) detector fast insertion on extemal input Bus point is sent to can input FBosd threshold are the the be 12C bus PAL and SECAM matrix, angles are specific (0,104). NTSC matrix when contrai of the red and green OC levels far black white contrai point of the red, green, blue channel gain far (OSO) acts on limited can on be RGB OSO to RGB -12 dB. with Contrast through varies along the an maximum contrai bus. with on The main Beam Beam contrast when current current first, contrast limiter limiter then the OC voltage contraI brightness reaches input: voltage will -5 be dB. will act on

disabled (OSO)

decreased

attenuation

adjustment.

blanking

operates Fast read through detection below internai When second When threshold (oversize the the

retrace. status Ext fast When (insertion RGB is signals between signals than outputs

adjustment.

insertion blanking the

forced two is 0.7V)

has voltage at

demodulation

thresholds. first (or threshold external) voltage OSO level of 4V, the is

Bus internai

controlled RGB,

contrasto external

Contrast RGB on and

contrai OSO and on RGB external OSO

acts

on

selected. first and selected. second blanked the

inputs. RGB RGB is

FBosd

maximum is -24 dB, to

attenuation maximum -12 dB.

internai

thresholds, FBosd

RGB higher RGB

are the are

attenuation

limited

blanking

application).

Bus

controlled

saturation

(50dB).

Bus Half The reduction and voltage 0.7 contrast YUV contrai signals when on half half Pin: will be affected function input is by is 6 dB gain ON, than Bus black

controlled to white contrai OSO).

brightness, amplitude acts on

total at ali

range maximum

is

60%

of

the

contrasto (internai,

Brightness external,

RGB

sources

contrast contrast

turned higher

threshold

V Typ.

controlled

sharpness standards.

(peaking)

in

PALI

SECAM/NTSC Automatic Cut-off outputs The the signal green measurement is memorized the cut-off loop between cut-off three (Blue and current lines after range 1.5 is current is 2 loop: V (cut-off 3.5 V, 2.5 level V Typ.). during blanking first, then Black bus. it to video up is in stretch Two signal NTSC), modes is at RGB Bus When not controlled coring active on on

coring

function is

on

sharpness. ON, (below peaking 10 IRE). is

V and

sharpness amplitude

turned

measured the current Leakage internaI is

sequentially frame measured cathode the frame

low

signals

cathode red). is on cut-off made an

circuit, are

can provided

be

disabled one to be

through used (7.5IRE video

the when setsignal

current blanking, Capability

during internai after

transmitted other to be

with used

set-up when

capacitor. the external freeze no trozen formato loop inserted so

the

insert oversize through pulse off

pulses signal.

vertical capability cut-off that no cut-

transmitted

without

set-up(PAL/SECAM).

blanking bus when contrai, the are at OC

Cut-off is is 16/9 cut-off during once threshold. outputs the

there loop in on, the

Bus insert video f;e , blue

controlled a blue

Blue background RGB active.

screen on OSO

feature. the can screen be

It permits when

to no when

cut-off visible

lines

Warm-up is "cut-off' not acti

is available. screen is

displayed

detector: high Cut-off reaches will cut-off appear

power are will

levels loop

inserted active

lines. current APR TQFP till the the peak bus. total level controls APR (Automatic 64 package APR RGB at function output RGB the RGB only. Peak Can permits range. outputs RGB gai are maximum gives ON signal signals gain so and gives above that n APR (before (contrast) limited. For contrast, 3 APR 3 V(B/W) threshold V 70 (B/W) IRE at APR at Regulation) be to disabled take circuits OSO so function through advantage detects insertion), that signal at OFF, RGB at 70 of the in

be

cathode Thus are

warm-up trom

detection dark. is closed RGB to

picture

blanked

current

reference.

The the inactive The by black range

manual 12C bus. and RGB three level of

cut-off In there this

mode mode, are no are

can the

be

selected Icath input cut-off

through pin pulses. is

and above

threshold drive input and signal APR input input RGB

example, APR at

inserted controlled (8-bit

maximum 100 IRE

black 12C of 2.5V bus each typ.

levels

independently resolution). be adjusted The in a

registers RGB output

outputs. IRE, outputs, decrease 70

With IRE far the

can

RGB will RGB

amplitude

..I
output is always 3 V (B/W). The APR gai n contrai voltage is memorized on an external capacitor, gain decrease is very fasI, gain increase is very slow(several frames).

STV223XD/3XJ4X
Motional capacitante: CM = 12fF :t 2fF, Shunt capacitante: Cp < 7pF, , Senes resonance: RS < 70Q 3,582MHz XTAL specification (PAL N). Mode of operation: series resonance (without load capacity), Motional capacitante: Shunt capacitante: CM = 12fF:t 2fF,

5 -CHROMA

CIRCUIT Decoders

PAL/SECAMINTSC

SVHS Chroma input; bus controlled SVHS mode, -30 dB ACC range, -Integrated chroma base band delay fine, ON/OFF bus contrai. -Automatic standard identification, with possibility to forte the standard through the bus. -Thre~ crystals application capability far the South Amencan market: the first crystal on P}n XTAL 1 (3.5X MHz only), the second crystal on Pln XTAL2 (3.5X MHz only), and, the third crystal on Pin XTAL3/BTUN (3.5X MHz
I d f PAL/NTSC on y, use or l' f I ) app lca lon on y .action

Cp < 7pF,

Series resonance: RS < 70Q O.and:t 90<198> demodulation angles far PAL. angles far NTSC '

(O 90) or (O 104) demodulation b~s controll~d.

Bus controlled Hue adjustment in NTSC mode. flesh contrai. Bus controlled , , , . dlsable. Two auto~atlc fles~ control,charactenstlcs.
the normal one wlth :i: 10 correctlon range of :t 60., the wide one and a total with :t 20.

NTSC Automatic

PAL/NTSC Decoder ACC done by peak detector demodulation nf the burst. F Il , t t d k 'll f t, u y In egra e I er unc lon, VCO using two standard crystals: 4,43 MHz and 3.58 ~Hz. One crystal is int~rnally ~elected dependlng on the standard selectlon. A thlrd crystal can be used in PAL/NTSC applications only. on synchronous

correction and a total action range of :i: 90.. SECAM Decoder F Il , t t d k' u y In egra e Ill ero Fully integrated demodulators using PLL. I t t dd h ' n egra e e emp asls. 6. CHROMA STANDARD IDENTIFICATION

Sequen ttaIld en ttI'1ca tton .1 .
Three identification sequences:

.

VCO reference signal is available on Pin X1CTL. 4.433619 MHz XTAL specification. Mode of operation: series resonance (without load capaclty), M t, I ,t C 13fF o lana capacI ance: M = Shunt capacitante: Cp < 7pF,

-XTAL 1 (4.43 MHz) mode to identify either PAL or NTSC. -XTAL2 NTSC. (3.58 MHz) mode to identify either PAL or

:t 3fF ,
'

, -SECAM mode (XT AL 1 selectlon). In three crystals applications, the SECAM sequence is replaced by XTAL3 selection to identify either PAL or NTSC signals, .. PALINTSC Prtortty SECAM mode is locked after !wo identified SECAM sequencss.

Series resonance: RS< 70Q 3,579545 MHz XTAL specification (NTSC M). Mode of operation: series resonance (without load capacity), Motional capacitante: CM = 11fF :t 3fF Sh ' Cp < 7 p, F unI capacitante: Series resonance: RS< 70Q

SECAM mode can be selected in 50 Hz mode only, 3.575 MHz XTAL specification (PAL M). Mode of operation: series resonance (without load capacity), Blanking of the R-Y and B-Y outputs during colar search mode.

..I
TDA1771
5-2 Vertical
5-2-1 Feature
.RAMPGENERATOR .INDEPENDENTAMPLITUDEADJUSTEMENT .BUFFER .POWER STAGE AMPLIFIER

output(TDA

1771)

.FL YBACK GENERATOR .INTERNAL .THERMAL REFERENCE PROTECTION VOL TAGE

5-2-2 Pinning and Description

10

FLYBACK GENERATOR

9

Vs
INVERTING INPUT BUFFER OUTPUT

O

8 7

6
5 4
3

RAMPGENERATOR
GROUND HEIGHT ADJUSTMENT
TRIGGER INPUT

2
1

OUTPUT AGE Vs ST
POWER OUTPUT

5-2-3 Block Diagram

TRIGGER IN

II

..I

5-4-4 Block Diagram
~
+11) ><-:~~

~ c
-:<~ o
C

z

cC/)

WCC/)

z

~
C

>

"-:
li) ~

2J,c
=-=

tUO

~g

C/) ~C/)

o

lI:

j


oD.

~~

gUJ

-,8 lI:

D.

~
lI:

~I ~D.
Q ~

22
2:0",

~
~ > ~

~
lI: C

cu E

~
~z I-

-='" CUc
5.-

ti. D. Q

~C/)

.~ '"
c
CU E
O)

o

.

SQ
~
C/)

~~~

~

J

~

~~~ < C

d

cf

~ >
~ N
U

UJ

...I
7-1 No power
(Pa.ver Board) 1) Check F801 IF F801 is broken, replace it after checking this: 0801, 0802, 0803, 0804 2) Check 0801,0802,0816

NO

I (Main Board)

I

I Check 0801, 0801

I

NO

Check L801, 0802, 0803 CHECK 0001 Pin 34

Check R516, R116 Check 0081,0082 Check 0501 Check 0404, 0402

7-2 No Raster
HeaterVoltage is OK but No Raster.

Increase screen voltage by tum righI screen volume

NO

G

heck T461

,

0281

voltage Readjust screen

[!J
0901 heck

0902
0903

NO

Check 0501

7-3NoSound(Picture OK)
Do the volume contrai in max before check this routine.

Check the speaker Check 0601 Check 0602, 0603

VES

I Check 0601j

~

ROADSTAR MANAGEMENT SA. (INTERNATIONAL SERVICE DIVISION) Via Passeggiata, 1 - BALERNA - SWITZERLAND Tel. +4191-6975155 - Fax. +4191-6975151 e-mail: [email protected] ROADSTAR ITALIA S.P.A. SERVICE DIVISION (DOMESTIC ITALY) Viale Matteotti, 22 - CERNOBBIO (CO) -ITALY Tel. +39031-342340 - Fax. +39031-3346291